The Lake Pátzcuaro salamander is only found in a single lake in Mexico, with an estimated population of less than 100 in the wild. For 150 years, nuns in a nearby convent have been raising a population in captivity — keeping the species alive, but also making them into "cough medicine".

The ribs of Anderson's crocodile newt are untethered to any muscular attachments at their ends and jut into the skin along its back, giving it an armoured appearance. When threatened, it adopts an anti-predator posture — using its sharp rib tips to pierce the rows of bumps on its sides.

During mating season, male red salamanders are not aggressive towards each other. In fact, they actually court one another — this likely isn't a case of mistaken sex, but an attempt to trick rival males into wasting their sperm packets (spermatophores).